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Fiesta28 [93]
3 years ago
8

A village school starts at 8.30am and end at 3.45pm.how long is the school day​

Mathematics
2 answers:
vaieri [72.5K]3 years ago
4 0
7 hours and 15 minutes
klasskru [66]3 years ago
3 0

Answer:

7 hours and 15 minutes.

Step-by-step explanation:

Draw a timeline for this question.

8.30 + 7 hours = 3.30pm or 15 30

3.30 + 0.15 minutes = 3.45 or 15 45

7 hours + 0.15 minutes = 7 hours and 15 minutes.

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X = first integer, y = second integer (right after x)

since y is right after x, we can say
y = x+1

If the product of the two integers (x and y) is 42, then
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x*( y ) = 42
x*( x+1 ) = 42 ... y is replaced with x+1
x*x + x*1 = 42
x^2 + x = 42
x^2 + x - 42 = 0
(x + 7)(x - 6) = 0 ... factor
x + 7 = 0 or x - 6 = 0
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The result must be positive as the problem states it, so we toss out x = -7
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y = 6+1
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The two consecutive numbers are 6 and 7

The final answer is 6

Sure enough, 6*7 = 42 checks out
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